The " LM358 P" is an operational amplifier (op-amp) commonly manufactured by Texas Instruments, STMicroelectronics, and other semiconductor companies. The LM358P is typically found in dual-package op-amp configurations and is widely used in analog circuits.
Pin Function Specifications
The LM358 P is a dual op-amp, meaning it contains two operational amplifiers in a single package. This IC comes in several package types, with the most common being 8-pin DIP (Dual In-line Package) and 8-pin SOIC (Small Outline Integrated Circuit).
The 8-pin DIP package has the following pinout:
Pin Function Description 1 Output of Op-Amp 1 This is the output of the first operational amplifier (Op-Amp 1). It provides the amplified output based on the input signal fed to the corresponding inverting/non-inverting pins. 2 Inverting Input of Op-Amp 1 This is the inverting input of the first operational amplifier (Op-Amp 1). The input signal is applied here to create an inverted output depending on the configuration. 3 Non-Inverting Input of Op-Amp 1 This is the non-inverting input of Op-Amp 1. Signals applied to this input result in non-inverted amplification, depending on the op-amp configuration. 4 V- (Negative Supply) This is the negative Power supply pin. For proper operation, this pin should be connected to a negative voltage. 5 Non-Inverting Input of Op-Amp 2 This is the non-inverting input of the second operational amplifier (Op-Amp 2). Similar to Op-Amp 1, this pin will determine if the output is inverted or non-inverted. 6 Inverting Input of Op-Amp 2 This is the inverting input of the second operational amplifier (Op-Amp 2). The signal applied here will result in an inverted output if the op-amp is configured accordingly. 7 Output of Op-Amp 2 This is the output of the second operational amplifier (Op-Amp 2). It provides the amplified signal based on the applied input at the inverting or non-inverting input. 8 V+ (Positive Supply) This is the positive supply pin. The IC requires a positive voltage source connected here to power the operational amplifiers.Pin Count and Package Details
Number of Pins: 8 Package Type: DIP (Dual In-line Package) or SOIC (Small Outline Integrated Circuit)Detailed Function List for Each Pin:
Pin 1: Output of Op-Amp 1 Delivers the amplified signal from the first op-amp stage. Typically connected to external circuitry, such as filters , analog signal processing stages, etc. Pin 2: Inverting Input of Op-Amp 1 Receives the inverted input signal, leading to an inverted output signal depending on the feedback network. Commonly used for inverting amplifier configurations. Pin 3: Non-Inverting Input of Op-Amp 1 Receives the non-inverted input signal. Used for non-inverting amplifier configurations where the output maintains the same polarity as the input. Pin 4: V- (Negative Supply) Provides the negative power supply to the internal circuits of the op-amp. A negative voltage, such as -5V or -12V, is typically supplied to this pin. Pin 5: Non-Inverting Input of Op-Amp 2 The second operational amplifier's non-inverting input. Like Pin 3, it allows for non-inverted amplification when the correct input is applied. Pin 6: Inverting Input of Op-Amp 2 The second op-amp's inverting input. Used for inverting signal configurations and creating inverse output from the applied input. Pin 7: Output of Op-Amp 2 The output of the second op-amp. Connected to external circuits for signal amplification or further signal processing. Pin 8: V+ (Positive Supply) Supplies the positive voltage (e.g., +5V, +12V) to the op-amp. Powers the op-amp and determines the voltage limits for signal amplification.20 Common FAQ About LM358P Op-Amp
Q: What is the voltage supply range for LM358P? A: The LM358P typically operates with a dual supply voltage range from ±3V to ±18V or a single supply voltage of +5V to +36V.
Q: What is the output voltage range of the LM358P? A: The output voltage range is typically within the supply voltage range, but it may not reach the exact rail voltage. It can typically output within 1.5V of the supply rails.
Q: Can I use LM358P with a single supply voltage? A: Yes, the LM358P can operate with a single supply voltage, such as +5V or +12V, as long as the common-mode input voltage is within the specified range.
Q: What is the quiescent current of the LM358P? A: The LM358P has a low quiescent current, typically around 1.3mA per op-amp at 25°C.
Q: What is the input impedance of the LM358P? A: The LM358P has a high input impedance, typically greater than 10MΩ, making it suitable for high-impedance applications.
Q: Is LM358P suitable for high-frequency applications? A: The LM358P has a typical gain-bandwidth product of 1MHz, so it is not ideal for very high-frequency applications but works well for general analog tasks.
Q: Can I use the LM358P as a comparator ? A: The LM358P is designed as an operational amplifier, not a comparator. Using it as a comparator may result in slower switching times and other limitations.
Q: Can LM358P be used in buffer applications? A: Yes, LM358P can be used in voltage follower (buffer) configurations with a non-inverting input and output connected directly.
Q: What is the input offset voltage for LM358P? A: The typical input offset voltage for the LM358P is 2mV, which may need to be compensated for in precision applications.
Q: What is the common-mode rejection ratio (CMRR) of LM358P? A: The CMRR of the LM358P is typically 70dB at a gain of 100.
Q: How do I calculate the gain of an op-amp like LM358P? A: The gain of the LM358P can be calculated using the formula ( Gain = \frac{Rf}{R{in}} + 1 ), where ( Rf ) is the feedback resistor and ( R{in} ) is the input resistor.
Q: Can the LM358P be used in a differential amplifier circuit? A: Yes, the LM358P is commonly used in differential amplifier circuits, with one op-amp handling the differential input.
Q: How does the LM358P behave when the input voltage exceeds the supply voltage? A: The LM358P may experience output clipping when the input voltage exceeds the supply voltage or goes below the negative supply voltage.
Q: What is the output short-circuit protection of LM358P? A: The LM358P features output short-circuit protection, meaning it can tolerate brief shorts without damage, but prolonged shorting should be avoided.
Q: Can LM358P handle large capacitive loads? A: The LM358P is not ideal for driving large capacitive loads due to potential instability; however, it can drive moderate capacitive loads with proper compensation.
Q: What are the temperature characteristics of LM358P? A: The LM358P operates across a temperature range from -40°C to +85°C for commercial-grade versions.
Q: What is the slew rate of LM358P? A: The typical slew rate of the LM358P is 0.3V/µs, which limits its ability to amplify fast-changing signals.
Q: Can the LM358P be used for audio applications? A: Yes, the LM358P is suitable for low-frequency audio applications, but its slew rate and bandwidth may limit performance at higher frequencies.
Q: What is the typical power consumption of the LM358P? A: The LM358P consumes about 1.3mA of current per op-amp at 25°C.
Q: What are the common applications for the LM358P? A: Common applications for the LM358P include signal amplification, active filters, voltage followers, oscillators, and audio signal conditioning.
Conclusion
The LM358P is a widely used dual operational amplifier with an 8-pin configuration, ideal for a variety of low-frequency applications. Understanding its pinout, functionality, and key specifications will help ensure it is used effectively in electronic circuits.
